Accurate Vertical Ionization Energy of Water and Retrieval of True Ultraviolet Photoelectron Spectra of Aqueous Solutions.

Accurate Vertical Ionization Energy of Water and Retrieval of True Ultraviolet Photoelectron Spectra of Aqueous Solutions.
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水的准确垂直电离能和水溶液的真实紫外光光谱的检索。

DOI:
10.1021/acs.jpclett.2c01768
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发表时间:
2022-08-04
影响因子:
5.7
通讯作者:
Fielding, Helen H.
Fielding, Helen H.
中科院分区:
化学2区
文献类型:
--
作者:
Scholz, Michael S.;Fortune, William G.;Tau, Omri;Fielding, Helen H.

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紫外光电子能谱提供了一种直接测量价电子结构的方法;然而,由于缺乏对液态水中低能(<5 eV)电子的非弹性散射如何扭曲测量的电子动能分布的定量理解,其在水溶液中的应用受到阻碍。在这里,我们提出了一个有效的和广泛适用的方法,用于检索真实的紫外光电子光谱的水溶液。我们的方法结合了Monte Carlo模拟的电子散射和光谱反演,与分子动力学模拟的有机溶质在水溶液中的深度分布。它的应用被证明为液态水,苯酚和酚盐,这是无处不在的生物相关的结构图案的水溶液。
Ultraviolet (UV) photoelectron spectroscopy provides a direct way of measuring valence electronic structure; however, its application to aqueous solutions has been hampered by a lack of quantitative understanding of how inelastic scattering of low-energy (<5 eV) electrons in liquid water distorts the measured electron kinetic energy distributions. Here, we present an efficient and widely applicable method for retrieving true UV photoelectron spectra of aqueous solutions. Our method combines Monte Carlo simulations of electron scattering and spectral inversion, with molecular dynamics simulations of depth profiles of organic solutes in aqueous solution. Its application is demonstrated for both liquid water, and aqueous solutions of phenol and phenolate, which are ubiquitous biologically relevant structural motifs.
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